Created LED states (markdown)

LED-states.md

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+# LED states
+
+Most rusEFI units have four status LEDs 
+* Communication blue
+* Fatal/Critical error red
+* orange misc
+* green misc
+
+Some simpler units have only communication blue and Fatal red
+
+# Bootloader
+
+During bootloader operation all four LEDs are expected to blink
+
+# Normal operation
+
+During normal operation blue LED is supposed to always blink. Blue LED blinking frequency changes when USB connection is detected. Lack of any blinking means brand new from factory unit or completely unexpected firmware condition
+
+# Fatal error
+
+Solid red means critical error, power cycle is required